Madonna presents the award for song of the year to Taylor Swift for &ldquo;Shake It Off&rdquo; at the iHeartRadio Music Awards, Sunday, in Los Angeles. John Shearer/Invision for iHeartRadio/AP Images

Taylor Swift, winner of the awards for best lyrics for &ldquo;Blank Space&rdquo;, song of the year for &ldquo;Shake It Off&rdquo; and artist of the year, in the press room at the iHeartRadio Music Awards, Sunday, in Los Angeles. John Salangsang/Invision/AP

Taylor Swift in the press room with the awards for best lyrics for &ldquo;Blank Space&rdquo;, song of the year for &ldquo;Shake It Off&rdquo; and artist of the year at the iHeartRadio Music Awards, Sunday, in Los Angeles. John Salangsang/Invision/AP

Taylor Swift in the press room with the awards for best lyrics for &ldquo;Blank Space&rdquo;, song of the year for &ldquo;Shake It Off&rdquo; and artist of the year at the iHeartRadio Music Awards, Sunday, in Los Angeles. John Salangsang/Invision/AP